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To confirm, thanks to AMD's reversal following considerable backlash, they eventually decided that yes, B450 motherboards will support the Ryzen 5000 series ("Zen 3" architecture) by means of applying a BIOS update to B450 boards. This BIOS update, which will technically be a beta BIOS (explained below), will be engineered and provided by the actual motherboard manufacturers (such as MSI or Gigabyte) should they choose to release one for their particular boards.
https://www.build-gaming-computers.c...ort-zen-3.html